Mortgage Calculators

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Interest-Only Mortgage Comparison Calculator

Help me compare interest-only mortgages with different terms.

Calculate and compare (formatted side by side) the payment amounts for up to 4 interest-only mortgage loans. Enter your sale price, any down payment you're making, the interest rates and the lengths for the interest-only and amortized periods for each loan. This calculator will then show you the interest-only and amortized (after interest-only period) payment amounts, the total amount of interest you will pay and the total amount of money you will spend over the life of each loan. You can also enter the points and other closing costs and roll those into your loans. You can even enter additional payment amounts during the interest-only and amortized periods and the calculator will show you each loan's anticipated payoff time.

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Field Help

Input Fields

TitleA title for these calculator results that will help you identify it if you have printed out several versions of the calculator.

LenderThe name of your potential lender. This field is not required but may help if you have printed out several loan scenarios.

Sale PriceThe sale price for your property. (NOT the amount of money you plan to borrow.)

Down PaymentThe amount of money you plan to put as a down payment on your property.

Length of LoanHow long you will pay on this loan. Also choose whether 'Length of Loan' is years or months.

PointsThe number of points (or percentage of the loan amount) you'll be paying to close this loan. Check 'Roll into Loan' if the cost of the loan points is being financed and included in the 'Loan Amount'.

Other Closing CostsAny other costs you'll be paying during the closing of your loan. These might be costs like the appraisal, property taxes, property insurance, title insurance, realtor fees, etc. Check 'Roll into Loan' if your closing costs (not to include loan points) is being financed and included in the 'Loan Amount'.

Interest-Only Loan Period

Interest RateThe annual percentage rate you will pay for the interest-only portion of this loan.

LengthHow long you will pay on the interest-only portion of this loan. Also choose whether this 'Length' is years or months.

Additional PrincipalThe additional amount you will pay each month during the interest-only period of the loan (over the required 'Monthly Payment' amount) to pay down the principal on your loan.

Monthly Payment TypeSince you are only required to pay interest during the interest-only period, if you enter an 'Additional Principal' amount, you may choose to continue having fixed monthly payments or you may choose to continue to pay only the monthly interest (meaning the payment amount will drop a little each month).

FixedEven though you are only required to pay interest, paying 'Additional Principal' will reduce the interest each month and also reduce the required payment each month. Select 'Fixed' if you want to continue paying the same amount each month. The calculations will then be based on continuing to pay the first month's calculated payment each month.

MinPaying 'Additional Principal' will reduce the interest each month and, since you are only required to pay interest, also reduce the required payment each month. Select 'Minimum' if you want to calculate payments based on paying interest plus 'Additional Principal' only each month.

Amortized Loan Period

Interest RateThe annual percentage rate you will pay for the amortized portion of this loan.

LengthAfter the interest-only period, the rest of 'Length of Loan' is the amortized length.

Additional PrincipalThe additional amount you will pay each month during the amortized period of the loan (over the required 'Monthly Payment' amount) to pay down the principal on your loan.

Output Fields

Interest-Only Loan Period

(Average) Monthly Payment'Interest' + 'Additional Principal' (if entered) to be paid each month during the interest-only period. Actual payment could include escrow for insurance and property taxes plus private mortgage insurance (PMI).

Total PrincipalThe total principal that will be paid during the interest-only period. (Will be zero unless 'Additional Principal' is paid during the interest-only period.)

Total InterestThe total interest that will be paid during the interest-only period.

Total PaidThe total amount that will be paid during the interest-only period.

Number of PaymentsTotal number of payments during the interest-only period.

(Average) Annual CostThe amount you will pay each year of the interest-only period.

Amortized Loan Period

Monthly Payment'Principal' + 'Interest' + 'Additional Principal' (if entered) to be paid each month once the interest-only period has passed and the loan has converted to a fully amortized loan. Actual payment could include escrow for insurance and property taxes plus private mortgage insurance (PMI).

Total PrincipalThe total principal that will be paid during the amortized period.

Total InterestThe total interest that will be paid during the amortized period.

Total PaidThe total amount that will be paid during the amortized period.

Number of PaymentsTotal number of payments during the amortized period.

Annual CostThe amount you will pay each year of the amortized period.

Loan Totals

Loan Principal Amount'Sale Price' - 'Down Payment' + 'Points' (if rolled into loan) + 'Other Closing Costs' (if rolled into loan).

Total InterestTotal amount of interest you will pay over 'Length of Loan'.

Total PaidTotal amount of principal + interest you will pay over 'Length of Loan'.

Payoff TimeAmount of time until the loan is paid off.

Total Number of PaymentsThe number of payments you will make to pay off the loan.

Average Annual CostThe amount of money you will pay each year for this loan.

Points AmountThe points percentage applied to the amount you borrow gives the dollar amount the loan points will cost.

Total Property CostTotal cost of this property when you include the 'Sale Price', 'Points Amount', 'Other Closing Costs' and the 'Total Interest' to be paid on the mortgage.

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